E. Lucy Braun (April 19, 1889 – March 5, 1971) was a prominent botanist, ecologist, and expert on the forests of the eastern United States who was a professor of the University of Cincinnati. She was the first woman to be elected President of the Ecological Society of America, in 1950. She was an environmentalist before the term was popularized, and a pioneering woman in her field, winning many awards for her work.